Unusual military helicopter activity over east Phoenix, AZ, valley. 3-16-17. 8:12 pm.Two military helicopters flying rectangular paths around the East Valley of Phoenix AZ. Lead aircraft was a Cobra with lots of armor looking items hanging off each side of the aircraft. Second helicopter was a military type, id unknown, passenger type. Both aircraft were painted in a light gray color. I got a good look at the cobra with my binoculars, it was about 200 feet off the deck above my home in Mesa AZ. Both helicopters were flying at high speeds compared to the normal speed of police and medical helicopters that frequent the area. At the same time a prop driven aircraft was circling our part of the city at about 8 to 12 thousand feet during this 45 minute period of time. When the helicopters left the area the prop plane at high altitude left to the west. Unknown which way the 2 military helicopters left due to there low altitude. I realize this is not a UFO sighting but, unless this is an unannounced military exercise over a large city, something is going on. I have sat in my back yard a lot over the last 20 years, this situation is very unusual.((NUFORC Note: Source of the report elects to remain totally anonymous; provides no contact information. PD))